Underwater Navigation using Pseudolite

Krishneshwar Tiwary; G. Sharada; Amarjit Singh

doi:10.14429/dsj.61.1087

Krishneshwar Tiwary Scientist
G. Sharada
Amarjit Singh

DOI: https://doi.org/10.14429/dsj.61.1087

Keywords: pseudolite, navigation, underwater communication, underwater navigation, pseudo satellite

Abstract

Using pseudolite or pseudo satellite, a proven technology for ground and space applications for the augmentation of GPS, is proposed for underwater navigation. Global positioning systems (GPS) like positioning for underwater system, needs minimum of four pseudolite-ranging signals for pseudo-range and accumulated delta range measurements. Using four such measurements and using the models of underwater attenuation and delays, the navigation solution can be found. However, for application where the one-way ranging does not give good accuracy, alternative algorithms based upon the bi-directional and self-difference ranging is proposed using selfcalibrated pseudolite array algorithm. The hardware configuration is proposed for pseudolite transceiver for making the self-calibrated array. The pseudolite array, fixed or moored under the sea, can give position fixing similar to GPS for underwater applications.

Defence Science Journal, 2011, 61(4), pp.331-336, DOI:http://dx.doi.org/10.14429/dsj.61.1087

Author Biographies

Krishneshwar Tiwary, Scientist

Mr Krishneshwar Tiwary obtained his MTech (Computer Science and Engg) from Indian Institute of Technology, Roorkee and currently pursuing his PhD from Defence Institute of Advanced Technology (Deemed University), Pune. He is presently working as Scientist E at Defence Research and Development Laboratory (DRDL), Hyderabad. Some of his specific contributions are development of countdown timing system, telemetry ground station, DGPS system and IV&V of mission critical software for the Integrated Guided Missile Development Program of DRDO. His current interests include: Development of pseudolite-based navigation system, soft computing based target identification, and advanced estimation techniques.

G. Sharada

Ms Sharada obtained her MTech (Computer Science and Engg) from Osmania University, Hyderabad. She is presently working as Scientist F at DRDL. Presently she is working for design and development of automated C4I systems for missile and air defence applications. Her areas of interest include: Fault-tolerant system design for mission critical applications, air situation processing, and distributed collaborative combat management systems for air defence applications.

Amarjit Singh

Dr Amarjit Singh obtained his MTech (Mechanical) from Pune University and PhD (Hypersonic Aerodynamics) from Cranfield University, UK. He is presently working as Scientist G at TBRL, Chandigarh. Some of his specific contributions are: Setting up test and research facilities such as subsonic and supersonic wind tunnels, campus wide network CROWN, advanced computing facilities. His current areas of interest include: High-speed internal flows, shock wave boundary layer interactions, aircraft design, and computational fluid.